/*
 * Copyright 2017 data Artisans GmbH Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy of the
 * License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed
 * to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */

package com.dataartisans.flinktraining.exercises.datastream_java.utils;

import com.dataartisans.flinktraining.exercises.datastream_java.datatypes.ConnectedCarEvent;
import org.apache.flink.streaming.api.functions.AssignerWithPunctuatedWatermarks;
import org.apache.flink.streaming.api.watermark.Watermark;

public class ConnectedCarAssigner implements AssignerWithPunctuatedWatermarks<ConnectedCarEvent> {
    @Override
    public long extractTimestamp(ConnectedCarEvent event, long previousElementTimestamp) {
        return event.timestamp;
    }

    @Override
    public Watermark checkAndGetNextWatermark(ConnectedCarEvent event, long extractedTimestamp) {
        // simply emit a watermark with every event
        return new Watermark(extractedTimestamp - 30000);
    }
}
